Trimage – A cross-platform tool for losslessly optimizing PNG and JPG files

“Trimage is a cross-platform GUI and command-line interface to
optimize image files via optipng, advpng and jpegoptim, depending
on the filetype (currently, PNG and PG files are supported). It was
inspired by imageoptim. All image files are losslessy compressed on
the highest available compression levels. Trimage gives you various
input functions to fit your own workflow: A regular file dialog,
dragging and dropping and various command line options. Install
Trimage in ubuntu 10.04/9.10”

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